Most Weddings are dark.
If its dark, you need lens speed.
If you want speed, there are good, cheap primes or very expensive zooms.
Primes are faster than 2.8 but are more limiting. Zooms that are 2.8 are more expensive.
Prime setup for wedding work.
24L II or 28 1.8
50mm 1.2L or 50mm 1.4
135mm f2L or 100mm f2
70-200 2.8 L II.
Both are capable setups, primes offer raw speed for less $$$ and zooms convenience. A mixed bag will increase weight of either option.
Pick your poison.
That's pretty much what I did. The 24-70L was staple. I also brought a 50, 85, and 135 prime. My kit was: zooms 24-70L and 70-200L, primes 50 f/1.4, 85 f/1.2L, 135 f/2L. Cameras: 5D Mark II and 1D Mark III backup body. Had a tripod and flash. Now all this wedding talk has got me thinking about getting into weddings again and as luck would have it, had sold my 24-70L. Now you guys are making me buy the 24-70L II. STOP IT!